led lamp power supply device

Abstract

The present invention proposes a power supply device for LED lamps, which mainly uses an isolation transformer to convert an input high-voltage AC signal into a low-voltage AC signal, and then generates a driving voltage for driving LED lamps, including: a waveform and frequency modulation module , which is set on the primary side of the isolation transformer, for modulating an input waveform and a frequency f, and the frequency f≥60Hz; and a secondary rectification and filtering module, which is set on the secondary side of the isolation transformer, for converting the The low-voltage AC signal after the isolation transformer is converted into the driving voltage, and the driving voltage is a low-voltage ripple signal, and a peak-to-peak value ΔV≧1 of the low-voltage ripple signal. In this way, the power supply device for LED lamps can still maintain normal operation by using the principle of persistence of vision of the human eye to modulate the voltage waveform and frequency for driving LEDs.

Description

technical field [0001] The present invention is related to the field of power supplies, in particular to a power supply device for LED lamps that utilizes the principle of persistence of vision of the human eye to modulate the voltage waveform and frequency for driving LEDs to maintain normal operation. Background technique [0002] Compared with general traditional light sources, light emitting diodes (Light Emitting Diode, LED) have the advantages of low voltage, low power consumption, and long life. Therefore, LEDs have been widely used in various special related fields that require light sources in today's life. For example, it is used in the backlight module of the display, the light source of the indicator light, the general lighting equipment and so on. Among them, because LED has a particularly significant advantage in energy saving and power saving, its practicability is particularly important in the most commonly used lighting purposes. [0003] The principle of ...

AI Technical Summary

Problems solved by technology

Due to high heat, the performance of electrolytic capacitors will deteriorate rapidly, resulting in shortened life and electrostatic capacity to only a fraction of the original, so that the filter capacitor function is equivalent to losing its effect

Therefore, although LED lamps have a long service life, they cannot be effectively matched with filter capacitors with the same service life, and the LED lamps cannot be used for normal operation.

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